Method of making chain bolts



H. E. WOERNLE METHOD OF MAKING CHAIN BOLTS Filed March 10, 3 923 FEGJINVENTOR and M) Patented Nov.

UNITED sr'rss HARRY E. WQERNLE, OF PITTSBURGH, 1?

ENNSYLVANIA, ASSIGNOB/ TO MCKINNEY MANUFACTURING COMPANY. OF EI'ITSBURGHPENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

, Application filed March 1923 To all whom it may concern:

Be it known that I, I'IARRY E. lVoinnNLn, a citizen of the lnitedStates, and resident of Pittsburgh, in the county of Allegheny and Stateof Pennsylvania, have invented a new and useful Improvement in Methodsof liflaking Chain Bolts; and I do hereby declare the following to be afull, clear, and exact description thereof.

My invention relates to bolts, and more particularly to a method ofmaking, chainbolts such as are withdrawn by pulling, on a chain, aspring being provided to return the bolt to normal position.

The object of my invention is to form a bolt of this character from asingle piece oi? wrought metal which is strong and durable, and which,by the simplicity of its manufacture, enables it to be produced at aminimum cost.

In the accompanying drawing, Fig. 'l is a side elevation of my improvedbolt, the bolt proper and the spring being shown. in dotted lines; Fig.2 is a front view partly in section; Fig. 3 is a front view of the boltremoved; Fig. is a side view; Fig. 5 is a rear View; Fig. 6 is a bottomplan view of the bolt casin and Figs. 7 and 8 are plan and edge views,respectively, of the blank from which the bolt proper is formed.

llhe blank 2, which may be formed from a. sheet 0] steel or othersuitable metal, has the enlar top-portion 3 V and the shank-portion textending: down theret'rom. The bolt is forn'ied from this blank bybendin; the upper portion A by means of suitable tools to form the uppertubular portion 5 of the bolt, while the shank-portion t, for a portionof its length, is bent around to form the sen-ii-circular portion 6 withthe shoulder 7 at the point where said portions meet.

Below the semi-circular portion 6 the shank-portion lof the blank isbent to form the flat or angular portion 8, a shoulder 9 beingconsequently formed between said flatportion 8 and the semi-circularportion 6.

The upper end of the blank 2 is convex, as at 10, and when the metal isbent to form the upper tubular portion 5 the upper end of the bolt isformed with the customary rounded or beveled portion 12.

The bolt so formed is inserted in the customary casing 13, which isprovided at its METHOD OF MAKING CHAIN BOLTS.

Serial No. 624,155.

lower end. with the slot 14: to receive the flattened lower portion 8 ofthe bolt. The spring 15 is interposed between the shoul der '7 and thelower end 16 of the casing, said spring: having; the tendency to holdthe bolt in locked position.

A clevis 17 is secured to the lower end of the Ilitt portion 8 whichprojects through the opening 14, and said clevis is connected to saidflat portion by the split pin 18. A chain 19 is connected to the clevis17. The clevis 17 -forms a stop which controls the upward movement ofthe bolt.

It will be apparent that the bolt may be readily reversed by withdrawingthe flat portion 8 from the opening 14 and turning the same, and thenreinserting said flat portion in said opening.

By my invention I provide a chain-bolt which is light in weight, and yethas sufiicient rigidity and strength to stand the wear and tear to whichit is subjected, while at the same time by being made of one piece ofwrought-metal the simplicity of manufacture makes it possible to formthe bolt quickly and at the same time at minimum cost.

What I claim is:

1. The method of forming bolts which comprises providing a substantiallyflat blank having a wide upper portion whose uppern'iost edge is ofsi'lbstantially arruato term, bending}; said portion to bring the sideedges thereof into adjacent position to form a tubular body portion,bending a portion of the blank to semicircular form of less diameterthan said body portion, and forming a shank portion below saidintermediate portion of angular form in cross section.

2. The method. of forming bolts which comprises providing asubstantially flat blank having a wide upper portion, bending saidportion to bring the side edges thereof into adjacent position to form atubular body portion, bending a portion of the blank to semi-circularform of less diameter than said body portion, and forming a shankportion below said intermediate portion of angular form in crosssection.

In testimony whereof I, the said HARRY E. WOERNLE, have hereunto set myhand.

HARRY E. WOERNLE.

